1. Department of Internal Medicine II, University Hospital Regensburg, Germany
2. Department of Cardiology, Heart and Diabetes Center North Rhine‐Westphalia, Bad Oeynhausen, Germany
3. ResMed Science Center, Martinsried, Germany
4. Clinic III for Internal Medicine, Heart Center University Hospital Cologne, Germany
5. Department of Pneumology, Ruhrlandklinik, West German Lung Center, University Hospital Essen University Duisburg‐Essen, Duisburg, Germany
6. Department of Medical Biometry and Epidemiology, University Medical Center Hamburg‐Eppendorf, Hamburg, Germany
7. Sleep and Ventilation Center Blaubeuren, Respiratory Center Ulm, Germany